INGREDIENTS
2 cups
all-purpose flour (measured correctly)
2 tsp
cornstarch
1 1/2 tsp
baking powder
1/2 tsp
salt
2 tbsp
lemon zest (about 2 medium lemons)
4 tbsp
unsalted butter*, melted and cooled slightly
2
large egg whites*, room temperature
2 tsp
vanilla extract
1 tsp
butter extract
1 1/4 cups
granulated sugar, divided